Casting table



April i 1924.

A. E. EVANS CASTING TABLE Filed Feb. 11 1921 v .min-

Q & ,,/...H,,U..... AWE-hl Wf/ %Me Patented Agent 1, i924,

ALBERT EVANS, OF IPITTSBUE'S- PENNSYLVANIA, .ASSIGHQR Ti) PITTSBURGH CASTING TABLE.

Application filed February 11, 1921.

T all whom it may concern:

Be it known that l, ALBERT E. Flvaius, a citizen of the United States, and a resident of Pittsburgh, in the county of .l'illegheny and State of Pennsylvania, have made a new and useful invention in Improvements in Casting Tables, of which the following is a specification.

The invention relates to casting tables for use in the manufacture of plate glass, and

has for its objects the provision of improved end as produced by the usual casting oper-.

ation; (3) whereby cutting or trimming of the rear edge of the sheet is avoided; and (4) whereby a device of simple construction is secured which is operated automatically and can be applied to existing tables to increase their capacity. Qne embodiment of the invention is illustrated in the accompanying drawings, wherein Figure 1 is a plan view of the rear end of a casting table; Figs. 2, 3 and 4 are transverse sections through the rear end of the table showing the roll and the parts to which the invention particularly relates in various positions, and Fig. is a detailed section through a modified form of stop plate.

Briefly stated, the invention contemplates the provision of a transverse stop plate at the rear end of a casting table, such stop plate being guided to work in a vertical plane along the end of the table, and when in operative position to project upwardly above the casting surface of the table and so constitute a stop against which the molten glass may engage preliminary to passing the roll over the table. The stop plate may be moved up and down either by hand or automatically by the roller itself, the arrangement being such that after the roller has passed over the rear end of the table, a release device is operated permitting the withdrawal of the stopplate downwardly so that its upper edge is on a level with the surface of the table, such movement exposing the rear edge of the glass sheet so that it may be engaged by a stowing tool after the rolling operation is completed. Provision is also Serial No. 444,097.

made for securing the upward movement of the stop plate after the roll has been moved back to its starting position. The stop plate construction may also be applied at the front end of the table if desired, as the application at this point would obviate the requirement for cutting the sheet oil at this end.

Referring to the drawings, 1 is a casting table provided along its side edges with the trams 22 upon which the roll 3 is supported; 44 rails for supporting the shove bar when it is moved forward to shove the glass plate into the annealing leer; 5 is a stop plate mounted for vertical movement upon the rear end of the table by means of the guide plates 66 shown in Fig. 1; 7 is a rock shaft extending transversely beneath the table and provided with a pair of rocker arms 8, having pivoted to their ends the upwardly extending arms 9 attached at their upper ends to the stop plate 5; and 10 is a lever keyed to the rec r shaft 7 and provided with a counterweight 11 for normally moving the stop plate to the position indicated in Fig. 2.

When the glass is cast upon the table the parts occupy the position shown in Fig. 2, the roll occupying its extreme rearmost position and the stop plate being in its uppermost position, so that together the roll and the plate limit the flow of glass to the rear. At this time the stop plate is held in the position shown by means of the counterweight 11 on the shatt 10.

The next position assumed by the parts is as shown in Fig, 3, at which time the roller in its forward movement engages the stop plate 5 and moves it downwardly, and also engages the end of the lever 12, such lever 12 being pivoted at 13 and having its other end connectedto the lever 10 by means of the rod 14. The downward movement of the right hand end of the lever 12 lifts the lever 10 upward until such lever assumes the position shown in Fig. .4, at which time the pawl or locking lever 15 engages the end of the lever 12 and prevents any movement of the lever 12 and the lever 10 after the roll has moved oi? oi the end of the lever 12 and to the position shown in Fig. 4. These move ments of the levers 12 and 10 cause the retraction of the stop plate 5 to the position indicated in Fig. 4, at which time its upper end is flush with the top surface of the casting table.

After the roll has passed forward, rolling the body of glass into a sheet upon the table, such roll is carried upward on its trams so as to free the glass sheet, this being a well known operation in the art, and the sheet is ready to be moved into the leer. This is ac complished by means of the shove bar it which rides forward along the rails iand engages the rear end of the glass sheet, pushing the sheet along the table beneath the roll and into the leer. This engz ,ement of the shove bar 16 with the rear end of the sheet is made possible by the wit idrawal of the stop plate 5 to the position indicated in Fig. 4. i-

The stop plate 5 and its operating parts are returned auton'iatically to the position shown in Fig. 2, when the roll is returned to the position illustrated in this figure.

This is accomplished byreason of th engagement ot the roll with the lever 17,

which is loosely mounted on the end of the roclr shaft 7 and connected by means of the rod 18 with the lower end of the pawl 15. This pawl is normally held by the spring 20 in the nosition shown in 4, but the engagement of the roll with the lever 17 pulls the lower end of the pawl to the right, thus releasing the left hand end of the lever 12 so that the counterweight lever is free to move downward,

thus moving the stop plate upward to the position of Fig. 2, at which time it can act as a stop for the molten glass which is teemed across the rear end of the table in front of the roll.

It will be seen that this expedient permits of the casting of a sheet of glass which extends to the extreme rear end or" the table,

thus increasing the capacity of the table. Also, that the rear end otthe sheet of glass is at right angles to its side edges and provides a good engaging surface for the shove bar, making it relatively easy to move the glass forward over the casting table.

The device is applicable to existing types of machines, and is operated automatically so that no additional labor is imposed upon the operatives. Other advantages incident to the construction will be readily apparent to those skilled in the art. lhe illustration of the construction is more or less diagammatic in order to clearly illustrate the principle, and it will be understood that various other arrangements might be adopted for giving the plate its automatic movement when it is desired to make such movement automatic. It may be desirable to water cool the stop plate, in which case the passage 19 is provided as indicated in Fig. 5, and suitable connections are made for circulating the water.

i fhat I claim is:

1. in combination with a glass casting table and roll, a stop member mounted for vertical movement at the rear end of the table and adapted to be withdrawn downward to permit the engagement of the edge of the glass sheet by a stowing tool, means for supporting the roll in position above the stop member so to co-act therewith as a dam for the molten glass, and means for moving said member up and down,

2. In combination with a glass casting table and roll, astop member mounted for vertical movement at the rear end of the table and adapted to be withdrawn downward to permit the engagement of the edge of the glass sheet by a stowing tool, and means operable by the forward movement of the roll for moving he member downward.

3. ln combinaion with a glass casting table and roll, a stop member mountet. for vertical movement at the rear end of the table and adapted to be withdrawn. downnard to permit the engagement of the edge of the glass sheet l a stowing tool, and mechanism operable by the movement or the roll forward for moving the member downward and by the movement of the roll ward for moving the member upward.

l. In combination with a glass casting table and roll, a stop plate mounted for movement up and down along the rear edge surface of the table, said plate in its upper position having its upper edge above the top surface of the table so as to vform a stop for the molten glass teemed across the table, and in its lower position having such upper edge retracted to expose the edge of the glass sheet cast upon the table, a stowing tool for engaging said edge, a support or the tool for guiding it into engagement with said edge, so that it may be engaged by a stowing tool, and means for moving the plate up and down.

5. In combination with a glass casting table, a stop member mounted for vertical movement up and down across the edge surface of the table at one end thereof, and adapted in one position to be withdrawn below the upper surface of the table, and in another position to extend above such upper surface and term a stop for the molten glass cast upon the table, a roll mounted for movement from a position di rectly above the stop member to the other end of the table, and means for moving the member up and down.

In testimony whereof, I have hereunto subscribed my name this 9th day of Febru ary, 1921.

ALBERT E. EVANS. 

